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Nuclear spectroscopist; Experimental nuclear physicist; Radiation physicist
  • Ph.D., Physics
    2009, Florida State University
  • M.S., Physics
    2005, Florida State University
  • B.S., Physics
    2004, University of Washington

I am an experimental nuclear physicist specializing in nuclear (gamma-ray and neutron) spectroscopy of solar system objects, fundamental nuclear physics, and radiation transport modeling. My spaceflight mission experience includes development and operation of gamma-ray and neutron spectroscopy instruments on MESSENGER, Dawn, Psyche, MMX, and Dragonfly. I'm the Principal Investigator for grants awarded under NASA's Planetary Mission Data Analysis Program (PMDAP), Mars Data Analysis Program (MDAP), and Discovery Data Analysis Program (DDAP). My planetary science research is focused is the elemental composition of Mercury, the Moon, and small solar-system objects (asteroids 433 Eros, 4 Vesta, 16 Psyche, and Mars' moons). I am also involved with nuclear physics research, making measurements of reaction cross sections aimed at improving our understanding of nuclear spallation (breakup) and light-cluster emission/breakup. I work extensiviely on the development of instrumentation, including radiation damage and repair of gamma-ray sensors, and the response of neutron sensors. I hold visiting researcher status at Brookhaven National Laboratory and the NIST Center for Neutron Research.

Notable Awards and Leadership

Year(s) Description
2019 NASA Group Achievement Award, Dawn at Ceres Science Team
2018 APL Technical Achievement Award, Outstanding Paper in the Johns Hopkins Technical Journall, for Dragonfly: A Rotocraft Lander Concept for Scientific Exploration of Titan (coauthor)
2017 NASA Group Achievement Award, MESSENGER Project Team
2016 APL Technical Achievement Award, Outstanding Research Paper in an Externally Referred Journal Publication, for Remote Sensing Evidence for a Ancient Carbon-Bearing Crust on Mercury, in Nature Geoscience
2013 APL Technical Achievement Award, Outstanding Research Paper in an Externally Referred Journal Publication, for Evidence for Water Ice Near Mercury's North Pole from MESSENGER Neutron Spectrometer Measurements, in Science Magazine (coauthor)
2013 NASA Group Achievement Award, Dawn at Vesta Science Team
2012 APL Technical Achievement Award, Authors First Paper in a Peer-Reviewed Journal, for Radioactive Elements on Mercury's Surface from MESSENGER: Implications for the Planet's Formation and Evolution, in Science Magazine
2003 Mary Gates Research Training Grant
1999-2000 Washington State Promise Scholarship

Scholarly Publications

Calibration of NASA’s Neutron Spectrometer System (NSS) for landed measurements of hydrogen content of the lunar subsurface

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2023
P.N. Peplowski, R.C. Elphic, E.L. Fritzler, Jack Wilson, (2023), Calibration of NASA's Neutron Spectrometer System (NSS) for landed measurements of hydrogen content of the lunar subsurface, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1049, 168063, https://doi.org/10.1016/j.nima.2023.168063

Current nuclear data needs for applications

Physical Review Research, 2022
Karolina Kolos, Vladimir Sobes, Ramona Vogt, Catherine E. Romano, Michael S. Smith, Lee A. Bernstein, David A. Brown, Mary T. Burkey, Yaron Danon, Mohamed A. Elsawi, Bethany L. Goldblum, Lawrence H. Heilbronn, Susan L. Hogle, Jesson Hutchinson, Ben Loer, Elizabeth A. McCutchan, Matthew R. Mumpower, Ellen M. O'Brien, Catherine Percher, Patrick N. Peplowski, Jennifer J. Ressler, Nicolas Schunck, Nicholas W. Thompson, Andrew S. Voyles, William Wieselquist, Michael Zerkle, (2022), Current nuclear data needs for applications, Physical Review Research, 4, 2, https://doi.org/10.1103/physrevresearch.4.021001

Cross sections for the production of radionuclides via natCu(p,X) spallation reactions for proton energies from 250 MeV to 2 GeV

Nuclear Physics A, 2021
Patrick Peplowski, (2021), Cross sections for the production of radionuclides via natCu(p,X) spallation reactions for proton energies from 250 MeV to 2 GeV, Nuclear Physics A, 1006, 122067, https://doi.org/10.1016/j.nuclphysa.2020.122067

MEGANE investigations of Phobos and the Small Body Mapping Tool

Earth, Planets and Space, 2021
Nancy Chabot, Patrick N. Peplowski, Carolyn M. Ernst, Hari Nair, Michael Lucks, R. Josh Steele, David J. Lawrence, (2021), MEGANE investigations of Phobos and the Small Body Mapping Tool, Earth, Planets and Space, 73, 1, https://doi.org/10.1186/s40623-021-01509-x

Science operation plan of Phobos and Deimos from the MMX spacecraft

Earth, Planets and Space, 2021
Tomoki Nakamura, Hitoshi Ikeda, Toru Kouyama, Hiromu Nakagawa, Hiroki Kusano, Hiroki Senshu, Shingo Kameda, Koji Matsumoto, Ferran Gonzalez-Franquesa, Naoya Ozaki, Yosuke Takeo, Nicola Baresi, Yusuke Oki, David J. Lawrence, Nancy L. Chabot, Patrick N. Peplowski, Maria Antonietta Barucci, Eric Sawyer, Shoichiro Yokota, Naoki Terada, Stephan Ulamec, Patrick Michel, Masanori Kobayashi, Sho Sasaki, Naru Hirata, Koji Wada, Hideaki Miyamoto, Takeshi Imamura, Naoko Ogawa, Kazunori Ogawa, Takahiro Iwata, Takane Imada, Hisashi Otake, Elisabet Canalias, Laurence Lorda, Simon Tardivel, Stéphane Mary, Makoto Kunugi, Seiji Mitsuhashi, Alain Doressoundiram, Frédéric Merlin, Sonia Fornasier, Jean-Michel Reess, Pernelle Bernardi, Shigeru Imai, Yasuyuki Ito, Hatsumi Ishida, Kiyoshi Kuramoto, Yasuhiro Kawakatsu, (2021), Science operation plan of Phobos and Deimos from the MMX spacecraft, Earth, Planets and Space, 73, 1, https://doi.org/10.1186/s40623-021-01546-6

Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission

Physical Review C, 2021
Jack Wilson, David J. Lawrence, Patrick N. Peplowski, Vincent Eke, Jacob Kegerreis, (2021), Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission, Physical Review C, 104, 4, https://doi.org/10.1103/physrevc.104.045501

Science Goals and Objectives for the Dragonfly Titan Rotorcraft Relocatable Lander

The Planetary Science Journal, 2021
Jason W. Barnes, Elizabeth P. Turtle, Melissa G. Trainer, Ralph Lorenz, Shannon M. MacKenzie, William B. Brinckerhoff, Morgan Cable, Carolyn Ernst, Caroline Freissinet, Kevin Hand, Alexander G. Hayes, Sarah Horst, Jeffrey R. Johnson, Erich M Karkoschka, David Lawrence, Alice Le Gall, Juan M. Lora, Christopher P. McKay, Richard Miller, Scott L. Murchie, Catherine Neish, Claire E. Newman, Jorge Núñez, Mark P. Panning, Ann M. Parsons, Patrick N. Peplowski, Lynnae Quick, Jani Radebaugh, Scot C. R. Rafkin, Hiroaki Shiraishi, Jason M. Soderblom, Kristin S. Sotzen, Angela M. Stickle, Ellen R. Stofan, Cyril Szopa, Tetsuya Tokano, Thomas Wagner, Colin Wilson, R. Aileen Yingst, Kris Zacny, Simon C. Stähler, (2021), Science Goals and Objectives for the Dragonfly Titan Rotorcraft Relocatable Lander, The Planetary Science Journal, 2, 4, 130, https://doi.org/10.3847/psj/abfdcf

Space-based measurements of neutron lifetime: Approaches to resolving the neutron lifetime anomaly

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2021
David Lawrence, Jack T. Wilson, Patrick N. Peplowski, (2021), Space-based measurements of neutron lifetime: Approaches to resolving the neutron lifetime anomaly, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 988, 164919, https://doi.org/10.1016/j.nima.2020.164919

Chemically distinct regions of Venus’s atmosphere revealed by measured N2 concentrations

Nature Astronomy, 2020
Patrick Peplowski, David Lawrence, Jack Wilson, (2020), Chemically distinct regions of Venus's atmosphere revealed by measured N2 concentrations, Nature Astronomy, 4, 10, 947--950, https://doi.org/10.1038/s41550-020-1079-2

Position-dependent neutron detection efficiency loss in 3He gas proportional counters

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2020
Patrick N. Peplowski, Zachary W. Yokley, Madison Liebel, Shuo Cheng, Richard C. Elphic, Shannon F. Hoogerheide, David Lawrence, Jeffrey S. Nico, (2020), Position-dependent neutron detection efficiency loss in 3He gas proportional counters, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 982, 164574, https://doi.org/10.1016/j.nima.2020.164574

Space-based measurement of the neutron lifetime using data from the neutron spectrometer on NASA's MESSENGER mission

Physical Review Research, 2020
Jack Wilson, David Lawrence, Patrick Peplowski, Vincent Eke, Jacob Kegerreis, (2020), Space-based measurement of the neutron lifetime using data from the neutron spectrometer on NASA's MESSENGER mission, Physical Review Research, 2, 2, https://doi.org/10.1103/physrevresearch.2.023316

Observations, Meteorites, and Models: A Preflight Assessment of the Composition and Formation of (16) Psyche

Journal of Geophysical Research: Planets, 2020
Linda Elkins-Tanton, E. Asphaug, J. F. Bell, H. Bercovici, Bruce Bills, R. Binzel, William Bottke, S. Dibb, David Lawrence, Simone Marchi, T. J. McCoy, Rona Oran, Ryan Park, Patrick Peplowski, C. A. Polanskey, Thomas Prettyman, Christopher Russell, Laura Schaefer, B. P. Weiss, Mark A. Wieczorek, David Williams, Maria T. Zuber, (2020), Observations, Meteorites, and Models: A Preflight Assessment of the Composition and Formation of (16) Psyche, Journal of Geophysical Research: Planets, 125, 3, https://doi.org/10.1029/2019je006296

Measuring the Elemental Composition of Phobos: The Mars‐moon Exploration with GAmma rays and NEutrons (MEGANE) Investigation for the Martian Moons eXploration (MMX) Mission

Earth and Space Science, 2019
David Lawrence, Patrick Peplowski, Andrew W. Beck, Morgan T. Burks, Nancy Chabot, Michael J. Cully, Richard C. Elphic, Carolyn Ernst, Samuel Fix, John O. Goldsten, Erin M. Hoffer, Hiroki Kusano, Scott Murchie, Brian C. Schratz, Tomohiro Usui, Zachary W. Yokley, (2019), Measuring the Elemental Composition of Phobos: The Mars-moon Exploration with GAmma rays and NEutrons (MEGANE) Investigation for the Martian Moons eXploration (MMX) Mission, Earth and Space Science, 6, 12, 2605--2623, https://doi.org/10.1029/2019ea000811

Radiation damage and annealing of three coaxial n-type germanium detectors: Preparation for spaceflight missions to asteroid 16 Psyche and Mars’ moon Phobos

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2019
Patrick N. Peplowski, Morgan Burks, John O. Goldsten, Samuel Fix, Lena E. Heffern, David J. Lawrence, Zachary W. Yokley, (2019), Radiation damage and annealing of three coaxial n-type germanium detectors: Preparation for spaceflight missions to asteroid 16 Psyche and Mars' moon Phobos, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 942, 162409, https://doi.org/10.1016/j.nima.2019.162409

Analytical Identification and Characterization of the Major Geochemical Terranes of Mercury's Northern Hemisphere

Journal of Geophysical Research: Planets, 2019
Patrick Peplowski, Karen Stockstill‐Cahill, (2019), Analytical Identification and Characterization of the Major Geochemical Terranes of Mercury's Northern Hemisphere, Journal of Geophysical Research: Planets, 124, 9, 2414--2429, https://doi.org/10.1029/2019je005997

Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2019
Patrick N. Peplowski, Jack T. Wilson, Morgan Burks, Andrew W. Beck, Insoo Jun, David J. Lawrence, Zachary W. Yokley, (2019), Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 446, 43--57, https://doi.org/10.1016/j.nimb.2019.03.023

Global Distribution and Spectral Properties of Low‐Reflectance Material on Mercury

Geophysical Research Letters, 2018
Rachel Klima, Brett Denevi, Carolyn Ernst, Scott Murchie, Patrick Peplowski, (2018), Global Distribution and Spectral Properties of Low-Reflectance Material on Mercury, Geophysical Research Letters, 45, 7, 2945--2953, https://doi.org/10.1002/2018gl077544

Characterizing near-surface elemental layering on Mars using gamma-ray spectroscopy: A proof-of-principle experiment

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2018
Patrick N. Peplowski, Jack T. Wilson, Andrew W. Beck, Morgan Burks, John O. Goldsten, David J. Lawrence, (2018), Characterizing near-surface elemental layering on Mars using gamma-ray spectroscopy: A proof-of-principle experiment, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 415, 89--99, https://doi.org/10.1016/j.nimb.2017.11.016

The Geochemical and Mineralogical Diversity of Mercury

Mercury, 2018
Timothy J. McCoy, Patrick N. Peplowski, Francis M. McCubbin, Shoshana Z. Weider, (2018), The Geochemical and Mineralogical Diversity of Mercury, Mercury, 176--190, https://doi.org/10.1017/9781316650684.008

The Chemical Composition of Mercury

Mercury, 2018
Larry R. Nittler, Nancy L. Chabot, Timothy L. Grove, Patrick N. Peplowski, (2018), The Chemical Composition of Mercury, Mercury, 30--51, https://doi.org/10.1017/9781316650684.003

Geochemistry, mineralogy, and petrology of boninitic and komatiitic rocks on the mercurian surface: Insights into the mercurian mantle

Icarus, 2017
Kathleen E. Vander Kaaden, Francis M. McCubbin, Larry R. Nittler, Patrick N. Peplowski, Shoshana Weider, Elizabeth A. Frank, Timothy J. McCoy, (2017), Geochemistry, mineralogy, and petrology of boninitic and komatiitic rocks on the mercurian surface: Insights into the mercurian mantle, Icarus, 285, 155--168, https://doi.org/10.1016/j.icarus.2016.11.041

A Low O/Si Ratio on the Surface of Mercury: Evidence for Silicon Smelting?

Journal of Geophysical Research: Planets, 2017
Francis McCubbin, Kathleen E. Vander Kaaden, Patrick Peplowski, Aaron S. Bell, Larry Nittler, Jeremy Boyce, Larry G. Evans, Lindsay P. Keller, Stephen Elardo, Timothy J. McCoy, (2017), A Low O/Si Ratio on the Surface of Mercury: Evidence for Silicon Smelting?, Journal of Geophysical Research: Planets, 122, 10, 2053--2076, https://doi.org/10.1002/2017je005367

The MESSENGER Gamma-Ray Spectrometer: Calibration and operations

Icarus, 2017
Larry G. Evans, Patrick Peplowski, Edgar A. Rhodes, John O. Goldsten, Richard D. Starr, Sean C. Solomon, (2017), The MESSENGER Gamma-Ray Spectrometer: Calibration and operations, Icarus, 288, 186--200, https://doi.org/10.1016/j.icarus.2017.01.022

Geochemistry of the lunar highlands as revealed by measurements of thermal neutrons

Journal of Geophysical Research-Planets, 2016
Patrick N. Peplowski, Andrew W. Beck, David J. Lawrence, (2016), Geochemistry of the lunar highlands as revealed by measurements of thermal neutrons, Journal of Geophysical Research-Planets, 121, 3, 388-401

Intense energetic electron flux enhancements in Mercury's magnetosphere: An integrated view with high-resolution observations from MESSENGER

Journal of Geophysical Research-Space Physics, 2016
Daniel N. Baker, Ryan M. Dewey, David J. Lawrence, John O. Goldsten, Patrick N. Peplowski, Haje Korth, James A. Slavin, Stamatios M. Krimigis, Brian J. Anderson, George C. Ho, Ralph L. McNutt, Jim M. Raines, David Schriver, Sean C. Solomon, (2016), Intense energetic electron flux enhancements in Mercury's magnetosphere: An integrated view with high-resolution observations from MESSENGER, Journal of Geophysical Research-Space Physics, 121, 3, 2171-2184

Remote sensing evidence for an ancient carbon-bearing crust on Mercury

Nature Geoscience, 2016
Patrick N. Peplowski, Rachel L. Klima, David J. Lawrence, Carolyn M. Ernst, Brett W. Denevi, Elizabeth A. Frank, John O. Goldsten, Scott L. Murchie, Larry R. Nittler, Sean C. Solomon, (2016), Remote sensing evidence for an ancient carbon-bearing crust on Mercury, Nature Geoscience, 9, 4, 273-+

Evidence from MESSENGER for sulfur- and carbon-driven explosive volcanism on Mercury

Geophysical Research Letters, 2016
Shoshana Z. Weider, Larry R. Nittler, Scott L. Murchie, Patrick N. Peplowski, Timothy J. McCoy, Laura Kerber, Christian Klimczak, Carolyn M. Ernst, Timothy A. Goudge, Richard D. Starr, Noam R. Izenberg, Rachel L. Klima, Sean C. Solomon, (2016), Evidence from MESSENGER for sulfur- and carbon-driven explosive volcanism on Mercury, Geophysical Research Letters, 43, 8, 3653--3661, https://doi.org/10.1002/2016gl068325

The global elemental composition of 433 Eros: First results from the NEAR gamma-ray spectrometer orbital dataset

Planetary and Space Science, 2016
Patrick N. Peplowski, (2016), The global elemental composition of 433 Eros: First results from the NEAR gamma-ray spectrometer orbital dataset, Planetary and Space Science, 134, 36--51, https://doi.org/10.1016/j.pss.2016.10.006

Bulk hydrogen abundances in the lunar highlands: Measurements from orbital neutron data

Icarus, 2015
David J. Lawrence, Patrick N. Peplowski, Jeffrey B. Plescia, Benjamin T. Greenhagen, Sylvestre Maurice, Thomas H. Prettyman, (2015), Bulk hydrogen abundances in the lunar highlands: Measurements from orbital neutron data, Icarus, 255, 127-134

Chlorine on the surface of Mercury: MESSENGER gamma-ray measurements and implications for the planet's formation and evolution

Icarus, 2015
Larry G. Evans, Patrick N. Peplowski, Francis M. McCubbin, Timothy J. McCoy, Larry R. Nittler, Mikhail Yu. Zolotov, Denton S. Ebel, David J. Lawrence, Richard D. Starr, Shoshana Z. Weider, Sean C. Solomon, (2015), Chlorine on the surface of Mercury: MESSENGER gamma-ray measurements and implications for the planet's formation and evolution, Icarus, 257, 417-427

Comprehensive survey of energetic electron events in Mercury's magnetosphere with data from the MESSENGER Gamma-Ray and Neutron Spectrometer

Journal of Geophysical Research-Space Physics, 2015
David J. Lawrence, Brian J. Anderson, Daniel N. Baker, William C. Feldman, George C. Ho, Haje Korth, Ralph L. McNutt, Patrick N. Peplowski, Sean C. Solomon, Richard D. Starr, Jon D. Vandegriff, Reka M. Winslow, (2015), Comprehensive survey of energetic electron events in Mercury's magnetosphere with data from the MESSENGER Gamma-Ray and Neutron Spectrometer, Journal of Geophysical Research-Space Physics, 120, 4, 2851-2876

Constraints on the abundance of carbon in near-surface materials on Mercury: Results from the MESSENGER Gamma-Ray Spectrometer

Planetary and Space Science, 2015
Patrick N. Peplowski, David J. Lawrence, Larry G. Evans, Rachel L. Klima, David T. Blewett, John O. Goldsten, Scott L. Murchie, Timothy J. McCoy, Larry R. Nittler, Sean C. Solomon, Richard D. Starr, Shoshana Z. Weider, (2015), Constraints on the abundance of carbon in near-surface materials on Mercury: Results from the MESSENGER Gamma-Ray Spectrometer, Planetary and Space Science, 108, 98-107

Evidence for geochemical terranes on Mercury: Global mapping of major elements with MESSENGER's X-Ray Spectrometer

Earth and Planetary Science Letters, 2015
Shoshana Z. Weider, Larry R. Nittler, Richard D. Starr, Ellen J. Crapster-Pregont, Patrick N. Peplowski, Brett W. Denevi, James W. Head, Paul K. Byrne, Steven A. Hauck, Denton S. Ebel, Sean C. Solomon, (2015), Evidence for geochemical terranes on Mercury: Global mapping of major elements with MESSENGER's X-Ray Spectrometer, Earth and Planetary Science Letters, 416, 109-120

Geochemical terranes of Mercury's northern hemisphere as revealed by MESSENGER neutron measurements

Icarus, 2015
Patrick N. Peplowski, David J. Lawrence, William C. Feldman, John O. Goldsten, David Bazell, Larry G. Evans, James W. Head, Larry R. Nittler, Sean C. Solomon, Shoshana Z. Weider, (2015), Geochemical terranes of Mercury's northern hemisphere as revealed by MESSENGER neutron measurements, Icarus, 253, 346-363

High-resolution mapping of lunar polar hydrogen with a low-resource orbital mission

Acta Astronautica, 2015
David J. Lawrence, Richard S. Miller, Martin T. Ozimek, Patrick N. Peplowski, Christopher J. Scott, (2015), High-resolution mapping of lunar polar hydrogen with a low-resource orbital mission, Acta Astronautica, 115, 452-462

Hydrogen and major element concentrations on 433 Eros: Evidence for an L- or LL-chondrite-like surface composition

Meteoritics & Planetary Science, 2015
Patrick N. Peplowski, David Bazell, Larry G. Evans, John O. Goldsten, David J. Lawrence, Larry R. Nittler, (2015), Hydrogen and major element concentrations on 433 Eros: Evidence for an L- or LL-chondrite-like surface composition, Meteoritics & Planetary Science, 50, 3, 353-367

Long-duration neutron production by nonflaring transients in the solar corona

Journal of Geophysical Research-Space Physics, 2015
William C. Feldman, David J. Lawrence, W. Thomas Vestrand, Daniel N. Baker, Patrick N. Peplowski, Douglas J. Rodgers, (2015), Long-duration neutron production by nonflaring transients in the solar corona, Journal of Geophysical Research-Space Physics, 120, 10, 8247-8266

Neutrons and energetic charged particles in the inner heliosphere: Measurements of the MESSENGER Neutron Spectrometer from 0.3 to 0.85 AU

Journal of Geophysical Research-Space Physics, 2015
Douglas J. Rodgers, David J. Lawrence, William C. Feldman, Patrick N. Peplowski, (2015), Neutrons and energetic charged particles in the inner heliosphere: Measurements of the MESSENGER Neutron Spectrometer from 0.3 to 0.85 AU, Journal of Geophysical Research-Space Physics, 120, 2, 841-854

The 4 June 2011 neutron event at Mercury: A defense of the solar origin hypothesis

Journal of Geophysical Research-Space Physics, 2015
David J. Lawrence, William C. Feldman, Patrick N. Peplowski, Sean C. Solomon, (2015), The 4 June 2011 neutron event at Mercury: A defense of the solar origin hypothesis, Journal of Geophysical Research-Space Physics, 120, 7, 5284-5289

Using HED meteorites to interpret neutron and gamma-ray data from asteroid4 Vesta

Meteoritics & Planetary Science, 2015
Andrew W. Beck, David J. Lawrence, Patrick N. Peplowski, Thomas H. Prettyman, Timothy J. McCoy, Harry Y. McSween, Michael J. Toplis, Naoyuki Yamashita, (2015), Using HED meteorites to interpret neutron and gamma-ray data from asteroid4 Vesta, Meteoritics & Planetary Science, 50, 8, 1311-1337

Detection and characterization of 0.5-8 MeV neutrons near Mercury: Evidence for a solar origin

Journal of Geophysical Research-Space Physics, 2014
David J. Lawrence, William C. Feldman, John O. Goldsten, Patrick N. Peplowski, Douglas J. Rodgers, Sean C. Solomon, (2014), Detection and characterization of 0.5-8 MeV neutrons near Mercury: Evidence for a solar origin, Journal of Geophysical Research-Space Physics, 119, 7, 5150-5171

Enhanced sodium abundance in Mercury's north polar region revealed by the MESSENGER Gamma-Ray Spectrometer

Icarus, 2014
Patrick N. Peplowski, Larry G. Evans, Karen R. Stockstill-Cahill, David J. Lawrence, John O. Goldsten, Timothy J. McCoy, Larry R. Nittler, Sean C. Solomon, Ann L. Sprague, Richard D. Starr, Shoshana Z. Weider, (2014), Enhanced sodium abundance in Mercury's north polar region revealed by the MESSENGER Gamma-Ray Spectrometer, Icarus, 228, 86-95

FAST NEUTRONS IN HEDS: NEW INSIGHTS INTO DAWN DATA AND NEUTRON SPECTROSCOPY

Meteoritics & Planetary Science, 2014
A. W. Beck, D. J. Lawrence, P. N. Peplowski, T. H. Prettyman, T. J. McCoy, (2014), FAST NEUTRONS IN HEDS: NEW INSIGHTS INTO DAWN DATA AND NEUTRON SPECTROSCOPY, Meteoritics & Planetary Science, 49, A28

Mercury's Weather-Beaten Surface: Understanding Mercury in the Context of Lunar and Asteroidal Space Weathering Studies

Space Science Reviews, 2014
Deborah L. Domingue, Clark R. Chapman, Rosemary M. Killen, Thomas H. Zurbuchen, Jason A. Gilbert, Menelaos Sarantos, Mehdi Benna, James A. Slavin, David Schriver, Pavel M. Travnicek, Thomas M. Orlando, Ann L. Sprague, David T. Blewett, Jeffrey J. Gillis-Davis, William C. Feldman, David J. Lawrence, George C. Ho, Denton S. Ebel, Larry R. Nittler, Faith Vilas, Carle M. Pieters, Sean C. Solomon, Catherine L. Johnson, Reka M. Winslow, Joern Helbert, Patrick N. Peplowski, Shoshana Z. Weider, Nelly Mouawad, Noam R. Izenberg, William E. McClintock, (2014), Mercury's Weather-Beaten Surface: Understanding Mercury in the Context of Lunar and Asteroidal Space Weathering Studies, Space Science Reviews, 181, 1-4, 121-214

RadFET Dosimeters in the Belt: the Van Allen Probes on Day 365

Ieee Transactions on Nuclear Science, 2014
A. G. Holmes-Siedle, J. O. Goldsten, R. H. Maurer, P. N. Peplowski, (2014), RadFET Dosimeters in the Belt: the Van Allen Probes on Day 365, Ieee Transactions on Nuclear Science, 61, 2, 948-954

Compositional variability on the surface of 4 Vesta revealed through GRaND measurements of high-energy gamma rays

Meteoritics & Planetary Science, 2013
Patrick N. Peplowski, David J. Lawrence, Thomas H. Prettyman, Naoyuki Yamashita, Dave Bazell, William C. Feldman, Lucille Le Corre, Timothy J. McCoy, Vishnu Reddy, Robert C. Reedy, Chris T. Russell, Michael J. Toplis, (2013), Compositional variability on the surface of 4 Vesta revealed through GRaND measurements of high-energy gamma rays, Meteoritics & Planetary Science, 48, 11, 2252-2270

Constraints on Vesta's elemental composition: Fast neutron measurements by Dawn's gamma ray and neutron detector

Meteoritics & Planetary Science, 2013
David J. Lawrence, Patrick N. Peplowski, Thomas H. Prettyman, William C. Feldman, David Bazell, David W. Mittlefehldt, Robert C. Reedy, Naoyuki Yamashita, (2013), Constraints on Vesta's elemental composition: Fast neutron measurements by Dawn's gamma ray and neutron detector, Meteoritics & Planetary Science, 48, 11, 2271-2288

Distribution of iron on Vesta

Meteoritics & Planetary Science, 2013
N. Yamashita, T. H. Prettyman, D. W. Mittlefehldt, M. J. Toplis, T. J. McCoy, A. W. Beck, R. C. Reedy, W. C. Feldman, D. J. Lawrence, P. N. Peplowski, O. Forni, H. Mizzon, C. A. Raymond, C. T. Russell, (2013), Distribution of iron on Vesta, Meteoritics & Planetary Science, 48, 11, 2237-2251

Early Results From the Engineering Radiation Monitor (ERM) and Solar Cell Monitor on the Van Allen Probes Mission

Ieee Transactions on Nuclear Science, 2013
Richard H. Maurer, John O. Goldsten, Patrick N. Peplowski, Andrew G. Holmes-Siedle, Michael H. Butler, Carl C. Herrmann, Barry H. Mauk, (2013), Early Results From the Engineering Radiation Monitor (ERM) and Solar Cell Monitor on the Van Allen Probes Mission, Ieee Transactions on Nuclear Science, 60, 6, 4053-4058

Evidence for Water Ice Near Mercury's North Pole from MESSENGER Neutron Spectrometer Measurements

Science, 2013
David J. Lawrence, William C. Feldman, John O. Goldsten, Sylvestre Maurice, Patrick N. Peplowski, Brian J. Anderson, David Bazell, Ralph L. McNutt, Larry R. Nittler, Thomas H. Prettyman, Douglas J. Rodgers, Sean C. Solomon, Shoshana Z. Weider, (2013), Evidence for Water Ice Near Mercury's North Pole from MESSENGER Neutron Spectrometer Measurements, Science, 339, 6117, 292-296

Neutron absorption constraints on the composition of 4 Vesta

Meteoritics & Planetary Science, 2013
Thomas H. Prettyman, David W. Mittlefehldt, Naoyuki Yamashita, Andrew W. Beck, William C. Feldman, John S. Hendricks, David J. Lawrence, Timothy J. McCoy, Harry Y. McSween, Patrick N. Peplowski, Robert C. Reedy, Michael J. Toplis, Lucille Le Corre, Hugau Mizzon, Vishnu Reddy, Timothy N. Titus, Carol A. Raymond, Christopher T. Russell, (2013), Neutron absorption constraints on the composition of 4 Vesta, Meteoritics & Planetary Science, 48, 11, 2211-2236

New insights into the global composition of the lunar surface from high-energy gamma rays measured by Lunar Prospector

Journal of Geophysical Research-Planets, 2013
Patrick N. Peplowski, David J. Lawrence, (2013), New insights into the global composition of the lunar surface from high-energy gamma rays measured by Lunar Prospector, Journal of Geophysical Research-Planets, 118, 4, 671-688

Olivine or impact melt: Nature of the "Orange" material on Vesta from Dawn

Icarus, 2013
Lucille Le Corre, Vishnu Reddy, Nico Schmedemann, Kris J. Becker, David P. O'Brien, Naoyuki Yamashita, Patrick N. Peplowski, Thomas H. Prettyman, Jian-Yang Li, Edward A. Cloutis, Brett W. Denevi, Thomas Kneisl, Eric Palmer, Robert W. Gaskell, Andreas Nathues, Michael J. Gaffey, David W. Mittlefehldt, William B. Garry, Holger Sierks, Christopher T. Russell, Carol A. Raymond, Maria C. De Sanctis, Eleonora Ammanito, (2013), Olivine or impact melt: Nature of the "Orange" material on Vesta from Dawn, Icarus, 226, 2, 1568-1594

RADFET DOSIMETERS IN THE BELT: the VAN ALLEN PROBES ON DAY 365

2013 14th European Conference on Radiation and Its Effects on Components and Systems (Radecs), 2013
A. G. Holmes-Siedle, J. O. Goldsten, R. H. Maurer, P. N. Peplowski, IEEE, (2013), RADFET DOSIMETERS IN THE BELT: the VAN ALLEN PROBES ON DAY 365, 2013 14th European Conference on Radiation and Its Effects on Components and Systems (Radecs)

Structure of B-8 from elastic and inelastic Be-7 + p scattering

Physical Review C, 2013
J. P. Mitchell, G. V. Rogachev, E. D. Johnson, L. T. Baby, K. W. Kemper, A. M. Moro, P. Peplowski, A. S. Volya, I. Wiedenhoever, (2013), Structure of B-8 from elastic and inelastic Be-7 + p scattering, Physical Review C, 87, 5

The distribution and origin of smooth plains on Mercury

Journal of Geophysical Research-Planets, 2013
Brett W. Denevi, Carolyn M. Ernst, Heather M. Meyer, Mark S. Robinson, Scott L. Murchie, Jennifer L. Whitten, James W. Head, Thomas R. Watters, Sean C. Solomon, Lillian R. Ostrach, Clark R. Chapman, Paul K. Byrne, Christian Klimczak, Patrick N. Peplowski, (2013), The distribution and origin of smooth plains on Mercury, Journal of Geophysical Research-Planets, 118, 5, 891-907

The Engineering Radiation Monitor for the Radiation Belt Storm Probes Mission

Space Science Reviews, 2013
J. O. Goldsten, R. H. Maurer, P. N. Peplowski, A. G. Holmes-Siedle, C. C. Herrmann, B. H. Mauk, (2013), The Engineering Radiation Monitor for the Radiation Belt Storm Probes Mission, Space Science Reviews, 179, 1-4, 485-502

Aluminum abundance on the surface of Mercury: Application of a new background-reduction technique for the analysis of gamma-ray spectroscopy data

Journal of Geophysical Research-Planets, 2012
Patrick N. Peplowski, Edgar A. Rhodes, David K. Hamara, David J. Lawrence, Larry G. Evans, Larry R. Nittler, Sean C. Solomon, (2012), Aluminum abundance on the surface of Mercury: Application of a new background-reduction technique for the analysis of gamma-ray spectroscopy data, Journal of Geophysical Research-Planets, 117

Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer

Journal of Geophysical Research-Planets, 2012
Larry G. Evans, Patrick N. Peplowski, Edgar A. Rhodes, David J. Lawrence, Timothy J. McCoy, Larry R. Nittler, Sean C. Solomon, Ann L. Sprague, Karen R. Stockstill-Cahill, Richard D. Starr, Shoshana Z. Weider, William V. Boynton, David K. Hamara, John O. Goldsten, (2012), Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer, Journal of Geophysical Research-Planets, 117

Operation of a He-3 proportional counter in the Ganymede radiation environment

Planetary and Space Science, 2012
Patrick N. Peplowski, Peter D. Hepplewhite, David J. Lawrence, William C. Feldman, Charles A. Hibbitts, (2012), Operation of a He-3 proportional counter in the Ganymede radiation environment, Planetary and Space Science, 61, 1, 46-52

Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer

Journal of Geophysical Research-Planets, 2012
Patrick N. Peplowski, David J. Lawrence, Edgar A. Rhodes, Ann L. Sprague, Timothy J. McCoy, Brett W. Denevi, Larry G. Evans, James W. Head, Larry R. Nittler, Sean C. Solomon, Karen R. Stockstill-Cahill, Shoshana Z. Weider, (2012), Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer, Journal of Geophysical Research-Planets, 117, L4

ABUNDANCES OF RADIOACTIVE ELEMENTS ON THE SURFACE OF MERCURY: FIRST RESULTS FROM THE MESSENGER GAMMA-RAY SPECTROMETER

Meteoritics & Planetary Science, 2011
P. N. Peplowski, D. K. Hamara, D. J. Lawrence, T. J. McCoy, W. V. Boynton, L. G. Evans, E. A. Rhodes, S. C. Solomon, L. R. Nittler, A. L. Sprague, (2011), ABUNDANCES OF RADIOACTIVE ELEMENTS ON THE SURFACE OF MERCURY: FIRST RESULTS FROM THE MESSENGER GAMMA-RAY SPECTROMETER, Meteoritics & Planetary Science, 46, A185

Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys

Planetary and Space Science, 2011
Edgar A. Rhodes, Larry G. Evans, Larry R. Nittler, Richard D. Starr, Ann L. Sprague, David J. Lawrence, Timothy J. Mccoy, Karen R. Stockstill-Cahill, John O. Goldsten, Patrick N. Peplowski, David K. Hamara, William V. Boynton, Sean C. Solomon, (2011), Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys, Planetary and Space Science, 59, 15, 1829-1841

Mapping iron abundances on the surface of Mercury: Predicted spatial resolution of the MESSENGER Gamma-Ray Spectrometer

Planetary and Space Science, 2011
Patrick N. Peplowski, David T. Blewett, Brett W. Denevi, Larry G. Evans, David J. Lawrence, Larry R. Nittler, Edgar A. Rhodes, Christina M. Selby, Sean C. Solomon, (2011), Mapping iron abundances on the surface of Mercury: Predicted spatial resolution of the MESSENGER Gamma-Ray Spectrometer, Planetary and Space Science, 59, 13, 1654-1658

Predictions of MESSENGER Neutron Spectrometer measurements for Mercury's north polar region

Planetary and Space Science, 2011
David J. Lawrence, John K. Harmon, William C. Feldman, John O. Goldsten, David A. Paige, Patrick N. Peplowski, Edgar A. Rhodes, Christina M. Selby, Sean C. Solomon, (2011), Predictions of MESSENGER Neutron Spectrometer measurements for Mercury's north polar region, Planetary and Space Science, 59, 13, 1665-1669

Radioactive Elements on Mercury's Surface from MESSENGER: Implications for the Planet's Formation and Evolution

Science, 2011
Patrick N. Peplowski, Larry G. Evans, Steven A. Hauck, Timothy J. McCoy, William V. Boynton, Jeffery J. Gillis-Davis, Denton S. Ebel, John O. Goldsten, David K. Hamara, David J. Lawrence, Ralph L. McNutt, Larry R. Nittler, Sean C. Solomon, Edgar A. Rhodes, Ann L. Sprague, Richard D. Starr, Karen R. Stockstill-Cahill, (2011), Radioactive Elements on Mercury's Surface from MESSENGER: Implications for the Planet's Formation and Evolution, Science, 333, 6051, 1850-1852

Applications of Nuclear Resonance Fluorescence

2010 Ieee Nuclear Science Symposium Conference Record (Nss/mic), 2010
Glen A. Warren, Rebecca S. Detwiler, Patrick N. Peplowski, IEEE, (2010), Applications of Nuclear Resonance Fluorescence, 2010 Ieee Nuclear Science Symposium Conference Record (Nss/mic), 534-541

Fission fragment isomers populated via Li-6+Th-232

Physical Review C, 2010
J. J. Ressler, J. A. Caggiano, C. J. Francy, P. N. Peplowski, J. M. Allmond, C. W. Beausang, L. A. Bernstein, D. L. Bleuel, J. T. Burke, P. Fallon, A. A. Hecht, D. V. Jordan, S. R. Lesher, M. A. McMahan, T. S. Palmer, L. Phair, N. D. Scielzo, P. G. Swearingen, G. A. Warren, M. Wiedeking, (2010), Fission fragment isomers populated via Li-6+Th-232, Physical Review C, 81, 1

Low-lying states in B-8

Physical Review C, 2010
J. P. Mitchell, G. V. Rogachev, E. D. Johnson, L. T. Baby, K. W. Kemper, A. M. Moro, P. N. Peplowski, A. Volya, I. Wiedenhoever, (2010), Low-lying states in B-8, Physical Review C, 82, 1

Lowest l=0 proton resonance in Si-26 and implications for nucleosynthesis of Al-26

Physical Review C, 2009
P. N. Peplowski, L. T. Baby, I. Wiedenhover, S. E. Dekat, E. Diffenderfer, D. L. Gay, O. Grubor-Urosevic, P. Hoflich, R. A. Kaye, N. Keeley, A. Rojas, A. Volya, (2009), Physical Review C, 79, 3

Potential Applications of Nuclear Resonance Fluorescence

International Conference on Applications of Nuclear Techniques, 2009
Glen Warren, Jac Caggiano, Patrick Peplowski, K BharuthRam, (2009), Potential Applications of Nuclear Resonance Fluorescence, International Conference on Applications of Nuclear Techniques, 1194, 106-119

Astrophysical reaction rate for the neutron-generator reaction C-13(alpha,n)O-16 in asymptotic giant branch stars

Physical Review Letters, 2006
E. D. Johnson, G. V. Rogachev, A. M. Mukhamedzhanov, L. T. Baby, S. Brown, W. T. Cluff, A. M. Crisp, E. Diffenderfer, V. Z. Goldberg, B. W. Green, T. Hinners, C. R. Hoffman, K. W. Kemper, O. Momotyuk, P. Peplowski, A. Pipidis, R. Reynolds, B. T. Roeder, (2006), Astrophysical reaction rate for the neutron-generator reaction C-13(alpha,n)O-16 in asymptotic giant branch stars, Physical Review Letters, 97, 19